When you ask "What number is halfway between 82 and 717?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=82 and Y=717.
To find the number halfway between 82 and 717, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 82 and 717 into our formula, we get:
(82 + 717)/2 = 399.5
Thus, the number halfway between 82 and 717 is 399.5.
To check that our answer is correct, we subtract 82 from 399.5 and subtract 399.5 from 717 and compare the two numbers:
399.5 - 82 = 317.5
717 - 399.5 = 317.5
As you can see, the halfway number is 317.5 higher than 82 and 317.5 lower than 717. Therefore, our halfway between answer of 399.5 above is correct.
Halfway Between
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Halfway Between 82 and 718
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